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Charging device and charging method for lithium secondary battery pack

A lithium secondary battery and charging method technology, applied in secondary battery charging/discharging, battery circuit devices, secondary battery repair/maintenance, etc., can solve problems such as low reliability, insufficient charge, low charging efficiency, etc. Achieve the effect of high reliability, low cost and high charging efficiency

Inactive Publication Date: 2009-12-09
林道勇 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to provide a charging device and charging method for a lithium secondary battery pack, which can effectively solve the problems of overcharging and undercharging that are easy to occur when lithium secondary battery packs are charged in series, and can avoid parallel charging Problems such as high cost of charging power supply, low reliability, low charging efficiency, and thick connection wire diameter

Method used

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  • Charging device and charging method for lithium secondary battery pack
  • Charging device and charging method for lithium secondary battery pack
  • Charging device and charging method for lithium secondary battery pack

Examples

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Embodiment 1

[0040] Such as figure 2 As shown, when charging 7 strings of 25.2V, 8Ah lithium cobalt oxide secondary battery packs for electric bicycles, a series charging circuit with a limit output voltage of 29.4V is connected in series at the total positive and total negative terminals of the cobalt oxide lithium secondary battery pack. Power supply, and charge in series with a limited charging current of 2A. At the same time, a parallel charging power supply with a limited output voltage of 4.2V and a limited output current of 200mA is connected in parallel at both ends of each battery to charge each single battery in parallel. During the charging process, series charging and parallel charging are carried out at the same time. If any single battery is fully charged, that is, its voltage reaches the overcharge protection voltage, the battery management system in the lithium cobalt oxide secondary battery pack will cut off the series charging power supply, and the series Charging is com...

Embodiment 2

[0042] Such as image 3 As shown, when charging an electric motorcycle with 13 strings of 48.1V, 15Ah lithium manganese oxide secondary battery packs, a series connection with a limit output voltage of 54.6V is connected in series at the total positive and total negative terminals of the lithium manganate secondary battery pack. Charging power supply, and charge in series with a limited charging current of 3A. If any single battery is fully charged, that is, its voltage reaches the overcharge protection voltage, the battery management system in the lithium manganate secondary battery pack will cut off the series charging power supply. , the series charging ends. Use a parallel charging power supply with a limited output voltage of 4.2V and a limited output current of 600mA to charge each unfilled single battery in parallel in turn. When each single battery is fully charged, the parallel charging ends. So far, the charging process of the lithium manganese oxide secondary batte...

Embodiment 3

[0044] Such as Figure 4 As shown, when charging 108 strings of 345.6V, 40Ah lithium iron phosphate secondary battery packs for hybrid electric vehicles, first, a limit output voltage is connected in series with the total positive and total negative ends of the lithium iron phosphate secondary battery pack. The series charging power supply is 394.2V and the charging current is limited to 80A for series charging. When a single battery is fully charged, that is, its voltage reaches the overcharge protection voltage, the battery management system in the battery pack will cut off the series charging power supply and charge in series. Finish. Then, use 108 parallel charging power supplies with a limited output voltage of 3.65V and a limited output current of 1A to charge in parallel at both ends of each single battery. When the voltage of each single battery reaches 3.65V, the battery is fully charged. , the charging ends.

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Abstract

The invention relates to a charging device and a charging method for lithium secondary battery pack, in particular to a charging device and a charging method for lithium secondary battery pack with a battery management system free of overcharge. The charging method of the lithium secondary battery pack provided by the invention combines a series charging and a constant-voltage current-limiting paralleled connection charging. The charging device thereof comprises at least a series charging power source and at least a paralleled connection charging source. The invention can solve the problems of overcharge and inadequate charge of series charging effectively and avoid the disadvantages of high cost, low reliability, low charging efficiency and thick connecting wire of charging power source of paralleled connection charging.

Description

technical field [0001] The invention relates to the field of using lithium secondary batteries, in particular to a charging device and a charging method for charging a lithium secondary battery pack with a battery management system. Background technique [0002] Lithium-ion battery is an ideal power source due to its high working voltage, small size, light weight, no memory effect, no pollution, small self-discharge, and long cycle life. In actual use, in order to obtain a higher discharge voltage, generally at least two single lithium secondary batteries are connected in series to form a lithium secondary battery pack for use. At present, lithium secondary battery packs have been widely used in various fields such as notebook computers, electric bicycles, electric vehicles, and backup power supplies. [0003] There are two charging methods for lithium secondary batteries: series charging and parallel charging. [0004] At present, the charging of lithium secondary batteri...

Claims

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Application Information

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IPC IPC(8): H01M10/44H02J7/00
CPCY02E60/12Y02E70/40Y02E60/10
Inventor 林道勇
Owner 林道勇
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